Altered herb assemblages in fragments of the Brazilian Atlantic forest
Altered herb assemblages in fragments of the Brazilian Atlantic forest
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巴西大西洋森林碎片中改变的草本组合
DOI：
10.1016/j.biocon.2015.08.014
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发表时间：
2015
影响因子：
5.9
通讯作者：
C. S. Zickel
中科院分区：
文献类型：
--
作者：
Patrícia Barbosa Lima;Liliane Ferreira Lima;Bráulio A. Santos;M. Tabarelli;C. S. Zickel
了解热带植物群落对人类干扰的响应对于在不断变化的世界中保护生物多样性至关重要。在这里，我们研究了在破碎的大西洋森林景观中，居住在小森林碎片中的林下草本植物组合所经历的变化，以推断栖息地丧失或破碎化所施加的群落水平变化。在10个森林碎片和10个森林内部斑块中随机设置100个25-m2样地，记录所有草本植物种类，测定凋落物积累量和土壤温度、湿度。共录得草本植物134种6027种，以蕨类、禾本科、禾本科、禾本科、莎草和蕨科植物为主。森林破碎片和森林内部草本植物密度相近，为64.4±57.8株/25 m2vs。56.1±44.1。在样地和生境空间尺度上，森林碎片物种丰富度下降了一半。在蕨类植物、蕨类植物和蕨类植物方面，碎片特别贫瘠，但支持增殖的本地草本植物和指示/专有物种的子集；即在分类学上和生态学上独特的草本植物群。碎片还支持较厚凋落物层覆盖的湿度较低的土壤，这些属性与两种森林栖息地的物种分布有关。研究结果表明，栖息地的丧失和破碎化，特别是光照和干燥森林边缘的建立，导致了特定生态类群的灭绝，少数物种/生态类群（如需要光的物种）经历了增殖。总的来说，这些过程导致了多个空间尺度上的贫瘠/改变的组合，潜在地限制了人类改造景观所提供的保护服务。
Understanding the response of tropical plant communities to human disturbance is critical for conserving biodiversity in a changing world. Here we examine the shifts experienced by understory herb assemblages while inhabiting small forest fragments in a fragmented Atlantic forest landscape to infer about community-level shifts imposed by either habitat loss or fragmentation. We established 100 25-m2plots, placed randomly in 10 forest fragments and 10 forest interior patches, in which all herb species were recorded, litter accumulation, soil temperature and moisture were estimated. We recorded a total of 6027 herbs belonging to 134 species, with a predominance of ferns, grasses, aroids, sedges and calatheas. Forest fragments and forest interior exhibited similar densities of herbs: 64.4 ± 57.8 herbs/25 m2vs. 56.1 ± 44.1, respectively. Species richness was reduced by a half in forest fragments at plot and habitat spatial scales. Fragments were particularly impoverished in terms of ferns, aroids and calatheas, but supported a subset of proliferating native herbs and indicator/exclusive species; i.e. a taxonomically and ecologically distinct herb flora. Fragments also supported less humid soils covered by a thicker litter layer and these attributes correlated to species distributions in both forest habitats. Our results suggest that habitat loss and fragmentation, particularly the establishment of illuminated and desiccated forest edges, result in the extirpation of particular ecological groups with a few species/ecological groups experiencing proliferation, such as light-demanding species. Collectively, these processes result in impoverished/altered assemblages at multiple spatial scales, potentially limiting the conservation services provided by human-modified landscapes.
影响因子：
5.9
作者：
Kolk, Jens;Naaf, Tobias
通讯作者：
Naaf, Tobias